Dual clutch gear oils are special fluids designed for automated transmissions that use two separate clutches for even and odd gears. These transmissions are known by the abbreviations DSG, or more generally DCT from the "Dual-Clutch Transmission". The fluid in this system performs several tasks simultaneously. It lubricates the gears and bearings in a similar way to a manual transmission. At the same time, however, it must cool and ensure the proper functioning of the clutches, which are often immersed in an oil bath, the so-called "wet clutches". The oil also serves as a hydraulic fluid that controls the gears and the clutches themselves. Proper frictional properties of the oil are key to smooth clutch engagement without slip or vibration. Using the wrong oil can lead to clutch damage, overheating and failure of the entire transmission.